HP Fabric Clustering System for InfiniBand™ Interconnect Performance on HP-UX 11iv2

Confidential Page 10 1/28/2005
Receive Bandwidth
Three application streams can saturate the receive bandwidth offered by the HP-UX HCA. Cumulative receive
bandwidth on a rx4640 (3 CPUs/1.5 GHz/2 GB RAM) for a message size of 64KB is 924.5MB/s; limited only by
the limitations of the PCI-X point of attachment.
Receive Bandwidth on rx4640
(
Ms
g
. Size - 64 KB, Processor Speed: 1.5GHz, 3 CPUs.
)
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
1000
123
Num ber of Parallel Streams
Bandwidth (MB/s)
0
2
4
6
8
10
12
14
16
18
20
Receive Side CPU Utilization % (per
stream)
Receive Bandw idth
Receive Side CPU Utilizatin (per
stream)
Transmit Bandwidth
On the transmit side, a single stream can drive the HCA to the limits of the interconnect solution. Using multiple
streams will have only insignificant gains.